Er... I wonder that your "im using Renpy" mislead many people, since what you ask for isn't at all related to Ren'py.
If I understand you correctly, the answer to your questions are :
No, you aren't creating some 3D models in DAZ studio, mostly because it's not a software made for model creation. What you are doing is creating 3D scenes ; it's something totally different.
You don't make them, you "get them, then use them".
- You do to
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- You select the house/car/whatever you want to use, buy it (if needed), use the DIM to download and install it (if bought from the Daz store), or download it and install it manually else.
- You open Daz Studio, then search the house/car/whatever you just installed, either in the "Smart Content" tab (if installed by using the DIM) or the "Content Library" tab (on the left panel).
- You double click on it then boom, the house/car/whatever is now part of your scene.
- You load the house/car/whatever in your scene, as said above.
- You search the "figure" you want to use, still either in the "Smart Content" tab or the "Content Library" one.
- You double click on it to load it in the scene.
Starting now, there's two possibilities, depending of what you effectively want to achieve :
Either you do this :
- You select the "figure", by example from the "scene" tab (on the right top panel).
- You move it to the place you want it from "General" section of the "parameters" tab (on the right bottom panel).
- You pose it the way you want, from the "Pose controls" section of the "parameters" tab (on the right bottom panel).
- You select the different bones, by example still from the "scene" tab (on the right top panel), and you tweak them the from the "General" section of the "parameters" tab (on the right bottom panel) to smooth the pose.
Or you do that :
- You select the "figure", by example from the "scene" tab (on the right top panel).
- You search in the "Smart Content" tab or the "Content Library" the pose you want to apply, and you double click on it.
- Depending of the pose, you can, or not, need to then move the "figure" (see above)
I don't want to be harsh or feel rude, but Daz Studio is the easiest software for this kind of things. Since you struggle with its basics features, I'm sure that any other software is not the best option for you. At least actually, this can change when you'll finally learn how to use Daz Studio.